Fair Value Measurements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable	$ 3,726,754	$ 3,718,944
Trading Securities, Change in Unrealized Holding Gain (Loss)	(8,000)	1,700	$ 3,000
Impairment of Real Estate		(84,389)	$ (18,536)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	40,089	49,513
Available-for-sale debt securities	14,492	15,599
Interest rate derivatives	6,575
Total	61,156	65,112
Interest Rate Cash Flow Hedge Liability at Fair Value		(2,858)
Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties		140,500
Impairment of Real Estate		(84,277)
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes Payable, Fair Value	3,333,378	4,103,533
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available-for-sale debt securities	14,492	15,599
Interest rate derivatives	6,575
Total	21,067	15,599
Interest Rate Cash Flow Hedge Liability at Fair Value		(2,858)
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities	40,089	49,513
Total	$ 40,089	49,513
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Operating properties		$ 140,500